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PRESENTATION ON WI-FI TECHNOLOGY

PRESENTATION ON WI-FI TECHNOLOGY. Contents. Need of WIFI Introduction Wi-Fi Technologies Wi-Fi Network Elements Wi-Fi Architecture How a Wi-Fi Network Works Wi-Fi Network Topologies Wi-Fi Security Post Implementation Advantages/ Disadvantages of Wi-Fi

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PRESENTATION ON WI-FI TECHNOLOGY

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  1. PRESENTATION ON WI-FI TECHNOLOGY

  2. Contents • Need of WIFI • Introduction • Wi-Fi Technologies • Wi-Fi Network Elements • Wi-Fi Architecture • How a Wi-Fi Network Works • Wi-Fi Network Topologies • Wi-Fi Security • Post Implementation • Advantages/ Disadvantages of Wi-Fi • Applications

  3. NEED ???? • Higher authorities do not want wiring • When guest/auditor comes then installation of new LAN is not possible • Employees seat is not fixed • Handling of cables(wires) is difficult

  4. Introduction • Wireless Technology is an alternative to Wired Technology, • Wi-Fi Network connect computers to each other, to the internet and to the wired network.

  5. The Wi-Fi Technology Wi-Fi Networks use Radio Technologies to transmit & receive data at high speed: • IEEE 802.11b • IEEE 802.11a • IEEE 802.11g

  6. IEEE 802.11b • Operates at 2.4GHz radio spectrum • 100 -150 feet range • Most popular, Least Expensive IEEE 802.11a • Operates at 5 GHz (less popular) • 50-75 feet range • More expensive,Notcompatible with 802.11b

  7. IEEE 802.11g Combine the feature of both standards (a,b) 100-150 feet range 2.4 GHz radio frequencies,Compatiblewith ‘b’

  8. Elements of a WI-FI Network 1.Switch --- Nortel WLAN 2360 2.Access point --- NORTEL WLAN 2330 3.Devices --- Mobiles, Laptop, Personal computers 4.WIFI Cards--- PCMCIA Cards, PCI Cards 5.Safeguards--- Antivirus & Firewalls

  9. WI FI Architecture

  10. How a Wi-Fi Network Works • Basic concept is same as Walkie talkies. • A Wi-Fi hotspot is created by installing an access point to an internet connection. • An access point acts as a base station. • When Wi-Fi enabled device encounters a hotspot the device can then connect to that network wirelessly. • A single access point can support up to 30 users and can function within a range of 100 – 150 feet indoors and up to 300 feet outdoors. • Many access points can be connected to each other via Ethernet cables to create a single large network.

  11. How are Multiple Transmitters Supported ? • Carrier Sense Medium Access with collision avoidance protocol (CSMA/CA) • Listen before talking • Avoid collision by explicit Acknowledgement (ACK) • Problem: additional overhead of ACK packets, so slow performance

  12. Wi-Fi Network Topologies • AP-based topology • Peer-to-peer topology • Point-to-multipoint bridge topology

  13. AP-based topology • The client communicate through Access Point.

  14. Peer-to-peer topology • AP is not required. • Client devices within a cell can communicate directly with each other. • It is useful for setting up of a wireless network quickly and easily.

  15. Point-to-multipoint bridge topology This is used to connect a LAN in one building to a LANs in other buildings even if the buildings are miles apart. These conditions receive a clear line of sight between buildings.

  16. WI-FI Security The requirements for Wi-Fi network security can be broken down into two primary components: • Authentication • User Authentication • Server Authentication • Privacy

  17. WI-FI Security Techniques • Service Set Identifier (SSID) • Wired Equivalent Privacy (WEP) • 802.1X Access Control • Wireless Protected Access (WPA) • IEEE 802.11i

  18. Post Implementation Test There are basically two types of testing to be done 1. QTR-WEB Testing 2. QTR-GUEST Testing

  19. QTR-WEB Testing Step1: • Click on Wireless icon on the Taskbar

  20. Step 2: Below shown window will appear, click on Refresh network list.

  21. Step 3: Double click on QTR-Web WI-FI Connection.

  22. Step 4: Insert the Authentication Key Step 5: Wait for few moments, while it is accruing the IP address

  23. Step 6: After acquiring the IP address it will show the connected as shown below

  24. Step 7:Now try to open any link it will redirect to the authentication page put user domain login ID and Password

  25. Step 8: Click on Yes on the below Security alert

  26. Step 9: It will be authenticated if below message will be shown on the web screen.

  27. Advantages • Mobility • Ease of Installation • Flexibility • Cost • Reliability • Security • Use unlicensed part of the radio spectrum • Roaming • Speed

  28. LIMITATIONS • Interference • Degradation in performance • High power consumption • Limited range

  29. Wi-Fi Applications • Home • Small Businesses • Large Corporations & Campuses • Health Care • Travellers

  30. THANKS

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